Handout picture released by the Argentinian Presidency of Argentinian Minister of Foreign Affairs Hector Timerman (R) and his Iranian counterpart Ali Akbar Salehi as they exchange documents in Addis Ababa, Ethiopia on January 27, 2013, after signing an agreement memorandum on the 1994 attacks to the Argentine Israelite Mutual Association (AMIA) in Buenos Aires. The signing took place in the framework of the African Union biannual summit. AFP PHOTO / ARGENTINIAN PRESIDENCYHO/AFP/Getty Images

Buenos Aires -- - Argentina and Iran agreed Sunday to establish an international "truth commission" to investigate a Jewish center bombing that killed 85 people in Buenos Aires 19 years ago.

The commissioners will examine the evidence and recommend how to proceed "based on the laws and regulations of both countries." Then, commissioners and Argentine investigators will travel to Tehran to question the suspects.

Argentine prosecutors have formally accused six Iranians of coordinating the attack under orders from their government. Among them is Iran's current defense minister, Ahmad Vahidi. The Argentines have spent years seeking to interrogate them with the help of Interpol, but Iran's government has refused until now to make them available.

This process, which needs legislative approval in both nations, provides a legal framework with due process rights for the accused that could be a model for conflict resolution, Fernandez said, and it puts the dispute firmly in the hands of legal experts overseen by independent arbitrators.

Jewish groups, however, made clear their discomfort at Argentina's efforts to improve relations with Iran despite the unresolved bombing case.

"It is a monumental step backward," Luis Czyzewski, who lost his daughter Paola in the bombing, told Argentina's Jewish News Agency on Sunday. "I think all the families will reject it and be as angry as I am."

A description of the agreement by Iran's Fars news agency said years of Argentine investigations "have failed to advance the case or prove anything against Iran, indicating that Iran is innocent."